Detachable boiler-flue.



J. M. GROZIEE.

- DETAUHABLE BOILER FLUB.

APPLICATION FILED JUNE 28, 1909.

Patented Oct. 11, 1910.

JOHN M. CROZIER, OF MINNEAPOLIS, MINNESOTA.

DETACHABLE BOILER-FLUE.

Specification of Letters Patent.

Application filed June 28, 1909.

Patented Oct. 11, 1910. Serial No. 504,661.

To all whom it may concern:

Be it known that I, JOHN M. ORozIER, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inDetachable Boiler-Flues; and I do hereby declare the following to be afull, clear, and exact de scription of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to detachable boiler flues, and has for its objectto improve the same in the several particulars hereinafter noted.

The invention consists of the novel devices and combinations of deviceshereinafter described and defined in the claim.

In the accompanying drawings which illustrate the invention, likecharacters indicate like parts throughout the several views.

Referring to the drawings: Figures 1 and 1 are supplemental views insection taken centrally and longitudinally through the improved flue,and showing also portions of the flue sheets to which the flue isapplied.

The numeral 1 indicates the flue sheets and the numeral 2 indicates theflue. The end portions of the flue are formed with gradual tapers thatextend for considerable distances on the body portion toward the extremeends of the flue. For the purpose of illustrating the approximate extentof taper, certain dimensions are marked on the flue, but it will, ofcourse, be understood that the flue may be made in various diameters, aswell as in various lengths. For illustration, however, the interior ofthe main body por tion of the flue is assumed to be 1?, inches, whilethe end portions of the flue are contracted to an internal diameter of1-5} inches. Otherwise stated, the end portions of the flue are taperedg, of an inch, and such taper extends preferably about six or eightinches from the ends of the flue before the maximum diameter of the flueis reached. Both ends of the flue are preferably given exactly the samecontraction.

On one end of the flue, a tapered sleeve 3 is welded or permanently andrigidly secured, while on the other end of the flue, a tapered sleeve 4.is closely fitted but mounted to slide. Both sleeves 3 and 4 are of thesame taper, and of the same diameter, so that the flue may be reversedend for end or inserted through either flue sheet, at will. To adapt theend of the flue to closely fit the interior of the sleeve 4 with asteamtight joint, that contracted end of the flue is first upset so asto increase the thickness of the wall of the flue at its end portion,and this thickened end portion is turned or machined to form a truecylindrical surface extending approximately from the point marked Y tothe end of the adjacent end of the flue. This true cylindrical surfaceis approximately of the same diameter as the tapered body portion of theflue at the point Y. Otherwise stated, the external diameter of thecylindrical end portion is approxi-' mately *2; of an inch less than themaximum external diameter of the flue body. To facilitate the withdrawalof the removable sleeve 4, it is provided with an annular flange 5 atits outer end. Copper gaskets or packing rims 6 are interposed betweenthe sleeves 3 and 4:, .and the seats provided therefor in the fluesheets 1.

As is evident, with the construction above described, all of the flueseats in the two flue sheets may be of the same diameter and taper, sothat the flues may be placed in position either through the seats of theflue sheet, of the fire box, or the flue sheet at the smoke box end ofthe boiler. F urthermore, by the arrangement described, the diameter ofthe flue seats is reduced to a minimum with a minimum of contraction ofthe ends of the flue, and the interior of the flue is left perfectlysmooth or without shoulders which will tend to collect sediment.

What I claim is 1- A flue having an end portion that is contracted, bothexternally and internally, the contracted exterior thereof being of truecylindrical form and of less diameter than the body of said tube, and anexternally tapered sleeve fitting the reduced cylindrical end portion ofsaid flue with a driving steam-tight joint, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN M. OROZIER.

Witnesses:

ALICE V. SwANsoN, HARRY D. KILooRE.

